Eichaed hunt and edgae siddons wilson



. with five times its bulk of water.

UNITED STATES PATENT OFFICE.

RICHARD HUNT AND EDGAR SIDDONS WILSON, OF LIVERPOOL, COUNTY OFLANCASTER, ENGLAND.

PROCESS OF REFINING AND CLARIFYING CRUDE COTTON-SEED OIL.

SPECIFICATION forming part of Letters Patent No. 365,921, dated July 5,1887.

Application filed April 27, 1887. Serial No. 236,348. (No specimens.)Patented in England February 1, 1887, No. 1,771.

To all whom it may concern.-

Be it known that we, RICHARD HUNT and EDGAR SIDDONs WrLsoN, subjects ofthe Queen of Great Britain, residing at Liverpool,

in the county of Lancaster, England, have invented a certain new anduseful Improvement in Refining and Clarifying Crude OottonSeed Oil, (forwhich we have applied for British Letters Patent No. 1,771, datedFebruary 4, 1887, and nowhere else;) and wedo hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it apperlains tomake and use the same.

The invention relates to the treatment of crude cotton-seed oil-that is,cotton seed oil expressed or obtained from cotton-seeds in any manner inwhich the oil is discolored and is more or less impure.

The object is to refine and clarify such oil in a simpleand-efficientmanner, so that a greater quantity of pure clear oil may beobtained at less expense and more readily than heretofore.

To carry our invention into effect most advantageously, we proceed inmanner follow ing: \rVe mix with the crude oil at a temperature of 110Fahrenheit two and a half per cent. of a solution of silicate of soda orsoluble glass of a strength of 140 Twaddle mixed The mixture of oil,silicate, and wateris agitated for from ten minutes to half an hour,after which it is left at rest until subsidence takes place say for aperiod of twenty-four hours. The

clear oil is then decanted. The foots or resi due, consisting mainly ofcoloring matter and silicate of soda, is practically free from oil. Ifless water is used, there will be suffilcient oil in the foots to makeit desirable to extract the same by heating or pressing.

Instead of silicate of soda, silicate of potash or tungstate of soda maybe used, but not so advantageously.

The temperature at which the treatment is conducted may vary from 50Fahrenheit to 250 Fahrenheit; but the temperature given is the one wehave found to answer best in practice. The percentage of-silicate ortungstate may also be varied according to the quality of the oiltreated, the more impure the oil the greater percentage. For averagequalities the percentage given answers well.

Vhen the oil treated as first above set forth is required of light colorfor soap-making or like purposes, the said oil is bleached by theaddition thereto of chloride of lime and sulphuric or hydrochloric acidin the usual manner.

The times allowed for agitation and subsid ence may also be varied, aswill be obvious.

Ve claim 1. An improvement in the art of refining or clarifying crudeoil, such as cottonseed oil, which consists in treating the same withsili cate of soda or itsfequivalent, substantially as and for thepurposes described.

2. An improvement in the art of refining or clarifying crude oil, suchascotton-secd oil, which consists in treating the same with silicate ofsoda or its equivalent, and then treating it with chloride of lime andan acid, substantially as and for the purposes described.

RICHARD HUNT. EDGAR SIDDONS WILSON. Witnesses:

J muss JonNsoN, W. B. JoI-rNsoN.

